Hi everybody.
I have a 1-N relationship. It's mapped using bag collection.

PlanoMensal has many Ocorrencia, and an Ocorrencia has only PlanoMensal.

I'm using the id increment method. So, the problem is. Ocorrencia has a property (dayOfMonth), and I wanna avoid registers with the same dayOfMonth and the same PlanoMensal. So, is it possible to do this without using composite ids and obviously without hardcode?
TIA.

On your mapping file for Ocarrencia, you can group your dayOfMonth and PlanoMensal using the <properties> logical grouping and specifying the unique constraint on it.

http://www.hibernate.org/hib_docs/v3/re ... properties